It's not really standard . That area tends to maintain the marry-merry-Mary distinction, which the overwhelming majority of Americans don't do. It maintains the cot-caught distinction, which was previously the standard but is the minority in young people these days and on its way out in a lot of the country. You also have the short-a split so that words like "had" and "ran" aren't rhymes with "bad" and "man", which is generally not even marked in dictionaries.
this is basically standard US english that you'd get from the internet, or watching 90s + 2000s television
It's not really standard . That area tends to maintain the marry-merry-Mary distinction, which the overwhelming majority of Americans don't do. It maintains the cot-caught distinction, which was previously the standard but is the minority in young people these days and on its way out in a lot of the country. You also have the short-a split so that words like "had" and "ran" aren't rhymes with "bad" and "man", which is generally not even marked in dictionaries.
this is wrong
Feel free to elaborate, but having two phonemes in words with historic short A is a common feature in the area. Doesn’t mean every speaker has it.